京津冀潮白河区域土地利用变化对生态系统服务的影响

Influence of land-use change on ecosystem services in the Chaobai River region of Beijing-Tianjin-Hebei

为探讨京津冀潮白河区域不同时期内的土地利用变化和生态系统服务(ES)的动态演变情况,采用土地利用动态度模型、当量因子法、敏感性指数法,分析该区域2001、2005、2009、2013年和2017年近20年来的土地利用数据。结果表明:在2001—2017年期间该区域耕地和农村居民点面积明显减少,城镇用地和水域面积明显增加;该区域的主要土地利用类型为耕地、农村居民点和城镇用地,且耕地和农村居民点的比例逐渐减少,城镇用地比例逐渐增大;城镇用地、工矿用地和水域的动态度呈现大幅增加趋势,农村居民点、耕地、草地和林地的动态度呈现较大幅的减少趋势。近20年来该区域的生态系统服务价值(ESV)整体上呈现增加的趋势,水域的生态系统服务价值增加对该流域生态系统服务价值变化起决定性作用。2001—2017年该区域内各地类的敏感性指数(CS)均小于1,敏感性指数从大到小依次为耕地>水域>林地>草地。综上,应根据该区域内土地利用变化对生态系统服务产生的影响,制定合理化政策、构建合理的土地利用格局,从而提升生态系统服务。

Based on analysis of land-use data from Chaobai River region in 2001,2005,2009,2013,and 2017,land-use change and the dynamic evolution of ecosystem services during different periods have been illustrated in this paper.A land-use dynamic attitude model,the equivalent factor method,and the sensitivity index method were used in this study.The results obtained:During the period of 2001—2017,the area covered by arable land and rural settlements in this region decreased significantly,while the proportion of urban land and water-cover increased gradually.The main types of land use in this region were arable land,rural settlement,and urban land.In addition,the specific gravity of the arable land and rural settlements reduced gradually,while that of urban land increased gradually.The dynamic degree of urban,industrial,and mining lands,as well as that of water-cover,increased greatly,while it reduced greatly for rural settle⁃ments,arable land,pasture,and forest.In the past 20 years,the ecosystem service value(ESV)of the region had been increasing,where the increase in the ESV of water-cover played a decisive role.From 2001 to 2017,the sensitivity index of all kinds of land in this region had been less than 1.The sensitivity index decreased in the order of arable land>water area>forest>pasture.In conclusion,according to information on the effect of land-use change on ecosystem services in this region,it is necessary to formulate proper policies and build a ra⁃tional land-use pattern to improve ecosystem services.